Finely chop the parsley, garlic, and oregano and place them in a bowl.
Add the olive oil, red wine vinegar, crushed red pepper flakes, salt, and black pepper to the bowl.
Mix everything together until well combined.
Let the chimichurri sit at room temperature for at least 30 minutes before serving to allow the flavors to meld together.
Use it as a marinade for grilled meats, a sauce for roasted vegetables, or a condiment for sandwiches and empanadas. Enjoy!